If a product comes in both a creamy formula and a foam formula, Dr. Suarez recommends always going with the creamy formula. The Neutrogena Ultra Gentle Hydrating Cleanser ($10) is the best Neutrogena soap for newly tattooed skin because it won't overstrip your skin of the natural oils it needs to restore itself. She also warned that the foaming formula has fragrance, so it shouldn't be used for tattoo aftercare. "The foaming cleanser uses mild sodium lauroyl sarcosinate while the hydrating cleanser uses a gentle plant-derived surfactant called sorbitan," Dr. Suarez explained. "Both are fairly mild, though sorbitan is considered one of the gentlest."